use alloy_consensus::{EnvKzgSettings, SidecarBuilder, SimpleCoder, TxEip4844Variant, TxEnvelope};
use alloy_eips::eip7702::SignedAuthorization;
use alloy_network::{
    eip2718::Encodable2718, Ethereum, EthereumWallet, TransactionBuilder, TransactionBuilder4844,
};
use alloy_primitives::{hex, Address, Bytes, TxKind, B256, U256};
use alloy_rpc_types_eth::{Authorization, TransactionInput, TransactionRequest};
use alloy_signer::SignerSync;
use alloy_signer_local::PrivateKeySigner;
use eyre::Ok;

/// Helper for transaction operations
#[derive(Debug)]
pub struct TransactionTestContext;

impl TransactionTestContext {
    /// Creates a static transfer and signs it, returning an envelope.
    pub async fn transfer_tx(chain_id: u64, wallet: PrivateKeySigner) -> TxEnvelope {
        let tx = tx(chain_id, 21000, None, None, 0, Some(20e9 as u128));
        Self::sign_tx(wallet, tx).await
    }

    /// Same as `transfer_tx`, but could set max fee per gas.
    pub async fn transfer_tx_with_gas_fee(
        chain_id: u64,
        max_fee_per_gas: Option<u128>,
        wallet: PrivateKeySigner,
    ) -> TxEnvelope {
        let tx = tx(chain_id, 21000, None, None, 0, max_fee_per_gas);
        Self::sign_tx(wallet, tx).await
    }

    /// Creates a static transfer and signs it, returning bytes.
    pub async fn transfer_tx_bytes(chain_id: u64, wallet: PrivateKeySigner) -> Bytes {
        let signed = Self::transfer_tx(chain_id, wallet).await;
        signed.encoded_2718().into()
    }

    /// Creates a deployment transaction and signs it, returning an envelope.
    pub async fn deploy_tx(
        chain_id: u64,
        gas: u64,
        init_code: Bytes,
        wallet: PrivateKeySigner,
    ) -> TxEnvelope {
        let tx = tx(chain_id, gas, Some(init_code), None, 0, Some(20e9 as u128));
        Self::sign_tx(wallet, tx).await
    }

    /// Creates a deployment transaction and signs it, returning bytes.
    pub async fn deploy_tx_bytes(
        chain_id: u64,
        gas: u64,
        init_code: Bytes,
        wallet: PrivateKeySigner,
    ) -> Bytes {
        let signed = Self::deploy_tx(chain_id, gas, init_code, wallet).await;
        signed.encoded_2718().into()
    }

    /// Creates an EIP-7702 set code transaction and signs it, returning an envelope.
    ///
    /// The EIP-7702 will delegate the code of the signer to the contract at `delegate_to`.
    pub async fn set_code_tx(
        chain_id: u64,
        delegate_to: Address,
        wallet: PrivateKeySigner,
    ) -> TxEnvelope {
        let authorization =
            Authorization { chain_id: U256::from(chain_id), address: delegate_to, nonce: 0 };
        let signature = wallet
            .sign_hash_sync(&authorization.signature_hash())
            .expect("could not sign authorization");
        let tx = tx(
            chain_id,
            48100,
            None,
            Some(authorization.into_signed(signature)),
            0,
            Some(20e9 as u128),
        );
        Self::sign_tx(wallet, tx).await
    }

    /// Creates an EIP-7702 set code transaction and signs it, returning bytes.
    ///
    /// The EIP-7702 will delegate the code of the signer to the contract at `delegate_to`.
    pub async fn set_code_tx_bytes(
        chain_id: u64,
        delegate_to: Address,
        wallet: PrivateKeySigner,
    ) -> Bytes {
        let signed = Self::set_code_tx(chain_id, delegate_to, wallet).await;
        signed.encoded_2718().into()
    }

    /// Creates a tx with blob sidecar and sign it
    pub async fn tx_with_blobs(
        chain_id: u64,
        wallet: PrivateKeySigner,
    ) -> eyre::Result<TxEnvelope> {
        let mut tx = tx(chain_id, 210000, None, None, 0, Some(20e9 as u128));

        let mut builder = SidecarBuilder::<SimpleCoder>::new();
        builder.ingest(b"dummy blob");
        tx.set_blob_sidecar(builder.build()?);
        tx.set_max_fee_per_blob_gas(15e9 as u128);

        let signed = Self::sign_tx(wallet, tx).await;
        Ok(signed)
    }

    /// Signs an arbitrary [`TransactionRequest`] using the provided wallet
    pub async fn sign_tx(wallet: PrivateKeySigner, tx: TransactionRequest) -> TxEnvelope {
        let signer = EthereumWallet::from(wallet);
        <TransactionRequest as TransactionBuilder<Ethereum>>::build(tx, &signer).await.unwrap()
    }

    /// Creates a tx with blob sidecar and sign it, returning bytes
    pub async fn tx_with_blobs_bytes(
        chain_id: u64,
        wallet: PrivateKeySigner,
    ) -> eyre::Result<Bytes> {
        let signed = Self::tx_with_blobs(chain_id, wallet).await?;

        Ok(signed.encoded_2718().into())
    }

    /// Creates and encodes an Optimism L1 block information transaction.
    pub async fn optimism_l1_block_info_tx(
        chain_id: u64,
        wallet: PrivateKeySigner,
        nonce: u64,
    ) -> Bytes {
        let l1_block_info = Bytes::from_static(&hex!(
            "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"
        ));
        let tx = tx(chain_id, 210000, Some(l1_block_info), None, nonce, Some(20e9 as u128));
        let signer = EthereumWallet::from(wallet);
        <TransactionRequest as TransactionBuilder<Ethereum>>::build(tx, &signer)
            .await
            .unwrap()
            .encoded_2718()
            .into()
    }

    /// Validates the sidecar of a given tx envelope and returns the versioned hashes
    #[track_caller]
    pub fn validate_sidecar(tx: TxEnvelope) -> Vec<B256> {
        let proof_setting = EnvKzgSettings::Default;

        match tx {
            TxEnvelope::Eip4844(signed) => match signed.tx() {
                TxEip4844Variant::TxEip4844WithSidecar(tx) => {
                    tx.validate_blob(proof_setting.get()).unwrap();
                    tx.sidecar.versioned_hashes().collect()
                }
                _ => panic!("Expected Eip4844 transaction with sidecar"),
            },
            _ => panic!("Expected Eip4844 transaction"),
        }
    }
}

/// Creates a type 2 transaction
fn tx(
    chain_id: u64,
    gas: u64,
    data: Option<Bytes>,
    delegate_to: Option<SignedAuthorization>,
    nonce: u64,
    max_fee_per_gas: Option<u128>,
) -> TransactionRequest {
    TransactionRequest {
        nonce: Some(nonce),
        value: Some(U256::from(100)),
        to: Some(TxKind::Call(Address::random())),
        gas: Some(gas),
        max_fee_per_gas,
        max_priority_fee_per_gas: Some(20e9 as u128),
        chain_id: Some(chain_id),
        input: TransactionInput { input: None, data },
        authorization_list: delegate_to.map(|addr| vec![addr]),
        ..Default::default()
    }
}
